/* ===== Reset & Base ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* 补偿固定导航栏高度，确保锚点跳转不被遮挡 */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Microsoft YaHei", sans-serif;
    color: #333;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.97);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    transition: background 0.3s;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.25rem;
    color: #1a3a5c;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-img {
    height: 44px;
    width: auto;
    display: block;
}

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    color: #555;
    transition: color 0.2s;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: #1a3a5c;
    transform: scaleX(0);
    transition: transform 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: #1a3a5c;
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #333;
    padding: 4px;
}

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background:
        linear-gradient(135deg, rgba(15,43,68,0.82) 0%, rgba(26,58,92,0.7) 50%, rgba(44,82,130,0.55) 100%),
        url('../images/hero-bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 1;
    color: #fff;
    max-width: 800px;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 12px;
    opacity: 0.9;
}

.hero-desc {
    font-size: 1rem;
    opacity: 0.7;
    margin-bottom: 36px;
    max-width: 600px;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    border: none;
}

.btn-primary {
    background: #e8831a;
    color: #fff;
}

.btn-primary:hover {
    background: #d07414;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(232, 131, 26, 0.35);
}

/* ===== Sections ===== */
.section {
    padding: 100px 0;
}

.section-alt {
    background: #f7f9fb;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: #1a3a5c;
    margin-bottom: 12px;
}

.section-desc {
    color: #777;
    font-size: 1.05rem;
}

/* ===== Products ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 32px;
}

/* ===== 产品分类分组 ===== */
.category-groups {
    display: block;
}

.category-group + .category-group {
    margin-top: 56px;
}

/* ===== 悬浮分类导航（右侧始终显示分类名）===== */
.category-dots {
    position: fixed;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    display: none;
    flex-direction: column;
    gap: 8px;
    z-index: 999;
}
.category-dots.show {
    display: flex;
}
.category-dots .dot {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    background: #fff;
    color: #1a3a5c;
    border: 1px solid #dbe3ec;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    white-space: nowrap;
    text-decoration: none;
    text-align: center;
    transition: all 0.15s;
}
.category-dots .dot:hover {
    background: #eef2f6;
}
.category-dots .dot.active {
    background: #1a3a5c;
    color: #fff;
    border-color: #1a3a5c;
}

.category-header {
    background: #f4f7fa;
    border-radius: 10px;
    padding: 16px 20px;
    margin-bottom: 24px;
}

.category-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1a3a5c;
    display: flex;
    align-items: center;
    gap: 10px;
}

.category-title-icon {
    font-size: 1.4rem;
    line-height: 1;
}

.category-title-en {
    font-size: 0.8rem;
    color: #aaa;
    font-weight: 400;
    margin-top: 3px;
}

.category-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.category-desc {
    font-size: 0.9rem;
    color: #5a6b7d;
    line-height: 1.5;
    margin: 10px 0 0;
}

/* 后台 emoji 快捷选择面板 */
.emoji-quick {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
}

.emoji-quick-label {
    font-size: 0.78rem;
    color: #999;
}

.emoji-quick-btn {
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 6px;
    padding: 4px 8px;
    font-size: 1.05rem;
    line-height: 1;
    cursor: pointer;
    transition: all 0.15s;
}

.emoji-quick-btn:hover {
    border-color: #2563eb;
    background: #eff6ff;
    transform: scale(1.08);
}

.category-title-icon img {
    width: 32px;
    height: 32px;
    object-fit: cover;
    border-radius: 6px;
}

.category-more {
    font-size: 0.9rem;
    color: #1a3a5c;
    white-space: nowrap;
    flex-shrink: 0;
}

.category-more:hover {
    text-decoration: underline;
}

@media (max-width: 480px) {
    .category-title {
        font-size: 1.25rem;
    }
    .category-more {
        font-size: 0.8rem;
    }
}

.product-card {
    display: block;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #eee;
    color: inherit;
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.product-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    background: #f0f4f8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: #1a3a5c;
}

.product-body {
    padding: 24px;
}

.product-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #1a3a5c;
    margin-bottom: 8px;
}

.product-title-en {
    font-size: 0.8rem;
    color: #aaa;
    font-weight: 400;
    margin-left: 6px;
}

.product-desc {
    font-size: 0.92rem;
    color: #666;
    margin-bottom: 16px;
    line-height: 1.7;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.product-tag {
    display: inline-block;
    padding: 4px 12px;
    background: #edf2f7;
    border-radius: 20px;
    font-size: 0.8rem;
    color: #1a3a5c;
}

/* ===== About ===== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    color: #555;
    margin-bottom: 16px;
    font-size: 1rem;
    line-height: 1.9;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 32px 16px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 800;
    color: #e8831a;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: #888;
}

/* ===== Contact ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: #1a3a5c;
    margin-bottom: 4px;
}

.contact-item p {
    color: #777;
    font-size: 0.95rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-form input,
.contact-form textarea {
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: #1a3a5c;
}

/* ===== 地图 ===== */
.contact-map {
    margin-top: 40px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    height: 360px;
    background: #e8edf2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-map .map-hint {
    color: #999;
    font-size: 0.9rem;
}

.map-external-link {
    margin-top: 10px;
    text-align: right;
    font-size: 0.85rem;
}

.map-external-link a {
    color: #1a3a5c;
    text-decoration: none;
}

.map-external-link a:hover {
    text-decoration: underline;
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    padding: 20px;
}

.modal-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: #fff;
    border-radius: 16px;
    max-width: 720px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 48px 44px 40px;
    position: relative;
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s;
}

.modal-overlay.open .modal {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: #f0f0f0;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    transition: background 0.2s;
}

.modal-close:hover {
    background: #e0e0e0;
    color: #333;
}

.modal-icon {
    font-size: 3.5rem;
    text-align: center;
    margin-bottom: 16px;
}

.modal-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: #1a3a5c;
    text-align: center;
    margin-bottom: 16px;
}

.modal-desc {
    font-size: 0.95rem;
    color: #555;
    line-height: 1.8;
    margin-bottom: 20px;
}

.modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.modal-tags .product-tag {
    padding: 6px 16px;
    font-size: 0.85rem;
}

.modal-params {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 28px;
}

.param-item {
    background: #f7f9fb;
    border-radius: 8px;
    padding: 12px 16px;
}

.param-label {
    font-size: 0.78rem;
    color: #999;
    display: block;
    margin-bottom: 2px;
}

.param-value {
    font-size: 0.92rem;
    color: #1a3a5c;
    font-weight: 600;
}

.modal-footer {
    text-align: center;
}

.modal-footer .btn {
    width: 100%;
}

/* ===== Scenarios ===== */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.scenario-card {
    background: #fff;
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    border: 1px solid #eee;
    transition: transform 0.3s, box-shadow 0.3s;
}

.scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.08);
}

.scenario-icon {
    display: block;
    margin-bottom: 16px;
}

.scenario-icon svg {
    width: 48px;
    height: 48px;
    color: #1a3a5c;
}

.scenario-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #1a3a5c;
    margin-bottom: 10px;
}

.scenario-card p {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.7;
}

/* ===== Advantages ===== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.advantage-card {
    background: #fff;
    border-radius: 12px;
    padding: 36px 28px;
    border: 1px solid #eee;
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

.advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.08);
}

.advantage-icon-wrap {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: linear-gradient(135deg, #edf2f7, #e2e8f0);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.advantage-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.advantage-icon svg {
    width: 36px;
    height: 36px;
    color: #1a3a5c;
}

.advantage-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #1a3a5c;
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.8;
}

/* ===== Footer ===== */
.footer {
    background: #0f2b44;
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
    padding: 24px 0;
    font-size: 0.85rem;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .scenarios-grid,
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }
}

@media (max-width: 768px) {
    .category-dots {
        display: none !important;
    }

    .nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        gap: 0;
    }

    .nav.open {
        display: flex;
    }

    .nav-link {
        padding: 12px 0;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-toggle {
        display: block;
    }

    .about-stats {
        grid-template-columns: 1fr;
    }

    .products-grid,
    .scenarios-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 1.7rem;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .contact-map {
        margin-top: 28px;
        height: 250px;
    }
}